Pump for concrete, mortar, and the like



July 2, 1940- R. LoNDAls PUIPFOR CONCRETE, MORTAR, AND THEYLIKE 3 Sheets-Sheet I l Idil-I Filed Oct. 27, 19:57

July`2, 1940. R. LoNDAls full? FOR CONCRETEVMORTAR, AND THE LIKE Filedl 001'.. 27,l 1937 5 Sheets-Sheet 2 JMIY 2 1940 R. LoNDAls 2,206,613

PUK? POR CONCRETE, MORTAR, AND THE LIKE Filed Oct. 27, 19:57V 5 SheetS-Sheet 5 l l xm .-.ee l

/ i Egger Lona/41's Patented July 2, 1940 v UNITED STATES 4PATENT 4"ol-FICE ruin Foa oouoliiloarm 'rmi` i l Roger Landais, Paris, France Application october 21, 1931, serial No. ruraisI In France November 4, 1936 (Cl. 103-227) My invention relates to a reciprocating pump 8` Claims.

for handling liquids transporting past-,y or solid material such as concrete, mortar, and the like, which pump may also, without any further in- 5. dependent mechanical valve, pump the scavenging and cleansing liquid for the piping.

One of the chief objects of my invention is an improved construction of pumps of the type comprising independent one-piece rotary suction and 10, discharge valves located near one7 another. I have found incontradistinction with prior work, that the operation oi these automatic valves and consequently that of the pumps themselves was greatly improved by the`concrete passing dlametricallythrough 'a widening and then narrowing automatic valve.

According to my invention therefore, in pumps .of the type referred to the diametrical passageway through at least one rotary valveis` widened at the end of said passageway, opposite to that which is adapted to register with' the inlet or outlet means leading to or from the pump cylin der.

v The widening of the valve merging into a predeterminedly narrowing part when suitably shaped, sized and located, allows a better and c more regular suction of the mixture through the valve Vand furthers the movementof the larger stones or other solid bodies contained in the mixture. as it allows their escape into and out of the valve bodies at the moments of closing and opening.

, 'I'he large surface of the widened part of the suction valve opening towards the feed hopper as provides a passage for the transfer of a volume of material equal to that forced through the axialV passage in the automatic `valve through the obturating part engaging same..

' The automatic discharge valve, the ilared op'en- 40 lng in which is adapted to face the delivery pipe,

prevents-a too. sudden stopping of the flow of material and thus the tendency oi.' said material to return backwards. the obturating action being performed through the part of the valve op'- posed to the widened part.

Heretofore the movement of the distributing .means was controlled by a rotary or oscillating cam, provided with a groove adapted to guide a roller secured to a lever controlling'the recipro- 5o eating distribution throughv a connection rod.l

` As at each reversal of motion the starting is sudden, there is a sudden shock and consequent damage of the pump is produced.'

My improved cam comprises operative positive portions providing va uniformly accelerated start and a uniformly decelerated end of stroke, The cam follower is held inengagement by a counter-roller. provides a greater mechanical yieldability, silence and life for the whole system. My improved cams are simple and ecoi; nomical in their manufacture. The outline isI designed in accordance with the movements it is desired'to obtain. The outline or the race oil the counter-roller is machined through guiding of the model cani in an arrangement correspondl0 ing to the characteristics of use. y

.Although the metals used are very hard chiefly for the valve proper and its', ring, the valves should not act uselessly as crusherswr shearers and a compensating spring' provides limitation l5 v ofthe stresses to a normal value during the closing movement.

When'the pumping is at anend, the pipes should be emptied. There has already been used therefor either a current of compressed air 20 or else an ladditional s et of spring-urged valves arranged inside the concrete pipes ahead of the inlet valve and beyond the outletr valve. I have found it is ble to provide this emptying or scavenging without any additionalindependent 25 valves, because my improved valves provide com plete closure andallow the normal forcing of a cleansing liquid through the pipe without any further independentvalve or the like, even for small forcing pressures. To this end for maxi- 30 mum efficiency o! the driving stroke, without any modification in the timing of the valves, the diametrlcal aperture in the suction valve is temporarily reduced tothe size strictly required for ucts which may have dried in the hole wherein it is held.l sneu plugs for changing thepamre 40 ofl the operation of a concrete or. the like pump have never been proposed and form"an important improvement for such pumps.

The concrete has' a tendency to coat and adhere to srew threads, and .therefore I have pro- 45 vided protected screw closures for the parts connecting the delivery with' the pump.

I will now describe by way of example a form oi' execution of my improved pu/mp, incorporat-A 50 ing the above features; Thisiorm of execution is illustrated in accompanying drawings.

Fig. 1 is a cross-section of the exempliiication, the section passing through the longitudinal aids of the/pump' su Fig. 2 is 'a cross-section of Fig. 4 along line Fig. 3 is a longitudinalecross-section of the valve showing the manner of its construction. Fig. 4 is an outer view of part of the pump..

Fig. 5 shows the sliding carrier of the uidtight system.

Fig. 6 is a cross section of a detail of the valve. Figs. 7 and 8`show respectively a rotary and an oscillating glooved cam according to prior art.

Fig. 9 shows the cam according to invention.

Fig. 10 is a side view of the control system for the cam.

Fig. 11 is a plan View of the rotary cam of Fig. 7.

Fig. 12 is a detail partly sectional view of `the controlling arm.

Fig. 13 shows a'removable cleansing'plug for the suction valve.

Fig. 14 is a cross-section thereof.

Figs. 15 and 16 are respectively top and bottom views of the plug.

Fig. 17. is a cross-sectional detail view of the plug.

Fig. 18 is an explanatory view oi the pump scavenging arrangement.

Fig. 19 is a part sectional view of the protected screw closures.

As shown in Fig. 1, the pump comprises a main cast portion 20 provided with handling apertures 2| and With a base 22 resting'on the ground. The suction valve is enclosed in a casing 23 having a partition in common with the casing 24 of the discharge valve.4 The outlet piping is shown at 25. -The piston 26 reciprocates in the wear-resisting lining 21 held down by a plate 28 fitted against the ring 29; there is a water reservoir to the rear of said plate 28 at 30, a packing being provided between the piston and the reservoir wall at 3| and a cover |34 closing the res- 'I 'he valve casings 23 and 24 are each provided with a lining 32 secured by a key 33. The upper part of the valve casing 23 carries the feed hopper 34 inserted inside a frustoconical base 35 securedthrough angle bars and bolts 36-31 to the casing 23.

The piston 26 is provided with a packing comprising two oppositely directed stamped parts 38-39 separated by a washer 40. 'I'his packing is mounted axially on a rod-shaped extension of part 4| carrying the gudgeon-pln 45, said packing being held between a counternut 42 andil a securing plate 43 by the nut 44 the head of which is protected. The gudgeon 45 is connected with the crank shaft `411through the connecting rod 46. The actuation of the crankshaft 41 is performed through the toothed wheel 4'8 meshing with the pinion 49 keyed to the shaft 5|. A pulley 50 secured to the same shaft 5| rotates inside the bearing 52 integral with the support 53 and is driven by the small pulley 54 driven in its turn by the motor 55 through the belt 56. Clutching means controlled by the lever |33 are inserted between the motor and the crankshaft drive. Thevsupport 53 is secured to the motor carrying frame 51 through bolts 58 while said frame51 is secured to the main portion or support 20 through bolts 59 of which only one is shown. The frame 51 has a central dish-shaped staying part, a discharge port peing provided for communication with a pipe 6| opening outside the' side ange.

To the toothed wheel 48 and consequently to the crankshaft 41 is secured the cam 62 which controls the rocking lever 63 carried by the shaft 64 4and carrying the spindle 65 on the connecting rod 66; the spindle 61 surrounded by the spring 68 forms an extension for the connecting rod 86 which is furthermore connected by the lever 89 with the rocking spindle 10 for the suction valve 1|. An entirely similar control system, not shown, is provided for the discharge valve 1|.

A valve 1| is shown in detail in Figs. 2 to 6. It includes a rocking spindle 10 with its control lever 69, said spindle being held with the interposition of the sleeve 13 inside the bearing 12 while the extension 14 of the spindle 10 is similarly held with its thrust plate 15, end ring 16 and cooperating bolt 11 inside the bearing 18 with the interposition of. the sleeve 19. The lubrication is performed through 80 while a packing and a stuiing box are at either end of the spindle 10-14 at 8| and 82. The valve body 1| is provided laterally with a ring 83 held by a plate 84 and a countersunk screw 85. To either side of the valve recess or housing 23-24 is arranged a water reservoir 86-81 the walls of which allow the passage of the spindles 'l0- 14 and which are tightly sealed at |29. These reservoirs may be drained through 88-89 and are provided with a huid-tightl rubber ring |29. To either side of the valve 1| and inside the corresponding reservoir, a ring issecuredto the rocking spindle through the screw 90 and retains a small spigot 9| through the washer 92 and the screw 93. This small spigot is threaded and allows the annular plate 94 to slide over it.v The annular plate 94 includes radial projections 95 and a longitudinally sliding spindle 96 engaging an aperture in the stationary ring. This annular plate 94 forms through its projections 95 a thrust bearing for the ring 91 which holds the packing 98 inside the lining 99 against the lining 32. The valve 1i has a hole |00 engaged bythe small spigot 9| described above.

Figs. 10 and 12 show in detail the control means. The roller |0| rolls over the race of the cam 62l and the roller |02 keeps it constantly in contact as it rolls on the outside of\the outline. The rocking spindle rocking in its bearings |03 carries the slide |04 and the journal |05 I,receiving the compression spring 68 held by the dished part |06. The latter is held by the counter nuts |01 and |08 screwed over the spindle 61 engaging frictionally the sleeve |09 integral with the connecting rod or tube 66. It is possible to insert between these parts a packing H0. The connecting rod 66 also carries a threaded sleeve which receives the end of, the connecting rod head with its counter nut H2. The connecting rod head or its axis ||3 is held by the screw I4. The axis H3 is held in the journals ||5 of the lever 69. .The rollers 0| and |02 are mounted on axes ||6 integral with the rocking lever 6,3 controlled by ithe cam 62 and acting on the spindle 61 and rod 66.

The plug ||1 used for water pumping purposes shown in Figs. 13 to 16 with a detail in Fig. 17, includes a handle ||8, a screw ||9 having a spigot-shaped extension, a bronze ring. |20, a passage for liquid |2|,.a boss |22 and'a male en' largement |23.

The part |24 used for securing a pipe to the screw is shown with rounded threads and a headI |21. Its ,shaftA has two diameters, the smaller at |28 and the larger at |30 and bears against u of stroke.

parts lli-,43M forming the flanges of the elements to be connected.

'I'he detail of .valve 1I or 'Il' (Fig. 3) shows how the diametrical passage is formed. The valve vbody is bored to a ldiameter T along the axis O-O. It meets another cylinder of same diameter having as axis a line X-X which is a further position of axis O--O after an angular shifting in the vertical plane of Fig. 3. The two cylindrical rrecesses described engage one another and the sharp ridge at their engagement is bev- Y 'of the valves 1i and 1i and the inside of the lining 32. This allowable play is of one half millimeter. Moreover the passage of small particles inside this play is prevented in practice by greasing the outside of the valve and the inside, of the lining 32.

The lsingle outline cam 62 produces the positive suitably timed movements with a uniformly accelerated start and a uniformly decelerated end It is obtained as follows (Fig. 9). The four strokes of the pump are provided by the four sections of the cam W.' Z, W', Z defined by the axes B-B and C-C as in-the prior art (Figs. 'I and 8) with rotating or rocking cams. The positive drive sections Z and Z are divided.- along .the circumference of the cam into equal angular parts [A to 8A. 'I'he negative drive sections W and VW' ending at B-B and C-C must be tangentiallyconnected with Z and Z. 'Ihe total radial-thrust produced by the cam as the spindle 61 advances through a distance Y, is measured radially along B-B and is divided in as many portions as the portion oi' the circumference corresponding to the drive section Z' for example, 8. division is unequal and follows the law of acceleration (1, 1+i, 1+i-+1, l

1|1+1| 1) for the four first periods, the division for which is shown along B-B, the four following periods being arranged reversely (4, 3, 2, l)

. as shown for greater clearness along C-C.

From all the points of division arranged along YB--B (and similarly along C-C). a portion oi' circumference is drawn and also rays from the centre of the cam through the points of division of the circumference. The points obtained by intersection o f the corresponding radii and the portion of the circumference thus drawn define the outline of the cam to be obtained for the drive section Z (and similarly Z). The actualhh ered. Similarly when the discharge is Aat end,J the automatic discharge valve must clope before the opening l2l isuncovered for pdssage of a fresh batch of scavenging or cleansing liquld. e

The operation of the pump may be briefly described as follows: the feed hopper being filled,y

with concrete or like material, the suction valve. Il opens under the action of the synchronized 'control system and the flaring portion oi' its diametrical passage opens towards the hopper.

material falls then through gravity as well as The through the action of the vacuum caused by the return stroke of the piston. At the beginning of the movement the automatic discharge valve 1I' is closed with a slight advance with reference to the movement of the automatic suction valve 1|, so that at the end of the stroke of the piston 2B, no return iiow of thematerial can occur. 'I'he suction of the material through the pump piston fills the pump cylinder. piston has almost arrived at the end of its stroke. the synchronised control system of the automatic valves gives each of them a position reverse with reference to that occupied just before; the suction valve 1I is closed slightly before 4the opening of the discharge valve 'll'. The 'latter closes again after discharge so as not yto interfere with the material discharge outlet 25. Ther cycle of movements begins then over again.

The removable plug lll is fitted inside the automatic valve 1l. vThe feed hopper is then fed.

with the scavenging or the cleansing liquid, the pump is started and the concrete or similar material scavenged. J

,A pump such as described affords the considerable advantage of providing in succession normal pumping for concrete mortar and the like and pumping of the cleansing water without any further modification, addition or adjustment except for the insertion ofthe plug Ill.

What I claim is:

l. A pump chiefly for concrete, mortar, and

`the like material comprising a cylinder, a piston,

control means for making said piston reciprocate inside said cylinder, suction means for said cylinder including a rotary valve and a casing therefor provided with two substantially opposite open-4 ings one of which is in substantially immediate communication with the'cylinder, exhaust means for said cylinder including a rotary valve and a casing therefor provided with two substantially opposite openings one of which is infsubstantially immediate communication with cylinder, saidvalves being provided each with a substantially diametrical passageway the ends of which are adapted to register with the corresponding openings of the corresponding valve `casing while .the end of the passage way for one of said valves,

which end is adapted to register with the casing opening remote from the cylinder, has a flaring shape, means for controlling said valves in Yoperative relationship .with the movements of 1 the piston. y v v 2. In a pump as, claimed in claim 1 the provision of annular packing rings for each valve, a spindle for the valve, a. disc rotatably mounted on said spindle,radial fingers on said disc and nieans carried by the spindle for urging said ngers against the packing rings.

3. A pump .chieiiy for concrete, mortar and the like material comprising a cylinder, a piston, I control means for making said piston reciprocate inside said cylinder, two valve casings the. wallsof which continue directly the wall of the cylinder and located towards one end thereof, said casings opening into the cylinder at points located close one another and having a. wall in comand exhaust, suction and exhaust ductsconnected with the outer openings in the corresponding casings, a valve arranged in each casing and provided with a substantially diametrical passageway one end of which is adapted to register withy the opening of the casing into the cylinder and the other end of which has a flaring shape for one of said valves and is adapted to register with the outer opening of its casing and means for controlling said valves in operative relationship with the movements of the piston.

4. In a pump vas claimed in claim 1 a perforated plug adapted to be removably fitted inside` the diametrical passageway of each valve during the scavenging with water and to restrict the passageway to an extent as will prevent altogether communication of the cylinder with the exhaust means for one valve and with the suction means for the other for a predetermined angular position of the valve considered.

5. A pump chiey for concrete, mortar and the like material comprising a cylinder, a piston, control means for making said piston reciprocate inside said cylinder, suction means for said cylinder including a rotary valve and provided with a suction opening, exhaust means for said cylinder including a rotary valve and provided with an exhaust opening, said valves being provided with a substantially diametrical passageway one end of which is adapted to open towards the cylinder andthe other end of which is adapted to open iaringly to the corresponding opening and means for controlling said valves in operative relationship with the movements of the piston, said means including cams adapted to provide a uniformly accelerated start and a uniformly decelerated stop motion for the valves at eachr operation thereof.

6. A-pump chiefly for concrete, mortar and the like material comprising a cylinder, a piston, control means for making said piston reciprocate inside said cylinder, suction means for said cylinder including a rotary valve and a casing therefor provided with two substantially opposite openings one of whichis in substantially immediate communication with the cylinder exhaust means for said cylinder including a rotary valve and a casing therefor provided with two substantially opposite openings one of which is in substantially immediate communication with the means for controlling said valves in operative relationship with the movements of the piston.

7. A pump chiefly for concrete, mortar and the like material comprising a cylinder, a piston, control means for making said piston reciprocate inside said cylinder, two valves casings the walls g of which continue directly the wall of the cylinder and located towards one end thereof, said casings opening into the cylinder at Vpoints located close one another and having a Wall in common at 'said points of close location, said casings having outer openings respectively for suction and exhaust, suction and exhaust ducts connected with the outer openings in the corres sponding casings, a valve arranged in each casing and provided with a substantially diametrical passageway one end of which is adapted to register with the opening of the casing into the cylinder and the other end of which has a aring shape for each of said valves and is'adapted to register with the outer opening of its casing and means for controlling said valves in operative relationship with the movements of the piston.

8. A pump chieiiy for concrete, mortar andthe like material comprising a cylinder, a piston, control means for making said piston reciprocate inside said cylinder, suction means for said cylinder including a rotary Valve, exhaust means for said cylinder including a rotary valve and provided with a suction opening, said valves andprovided with an exhaust opening being provided with a substantially diametrical passageway one end of which is adapted to open towards the cylinder and the other end of which has a flaring shape for each of said valves and is adapted to register with the corresponding opening and means for controlling said valves inoperative relationship with'the movement of the piston., said means including cams adapted to provide a uniformly accelerated start and a uniformly decelerated stop motion for the valves at each operation thereof. f'

ROGER LONDAIS. 

